| 发明名称 |
MAGNETIC PARTICLES |
| 摘要 |
Magnetic particles are cobalt surface treated gamma iron oxide (Fe2O3) having a specific area of at least 30 m2/g and a powder coercivity greater than about 450 Oe, the particles being coated with from about 10 to about 50% by weight of a material having a refractive index less than about the refractive index of a binder for the particles.
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| 申请公布号 |
US5217804(A) |
申请公布日期 |
1993.06.08 |
| 申请号 |
US19900609673 |
申请日期 |
1990.11.06 |
| 申请人 |
EASTMAN KODAK COMPANY |
发明人 |
JAMES, ROBERT O.;BERTUCCI, SIDNEY J.;OLTEAN, GEORGE L. |
| 分类号 |
C01G49/00;C09D5/23;C09D175/00;C09D175/04;G11B5/706;G11B5/712;H01F1/11 |
主分类号 |
C01G49/00 |
| 代理机构 |
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代理人 |
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| 主权项 |
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| 地址 |
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